Folded metal expansion-shield



- Fi .2. m Fig.1-

.I. E. OGDEN. FOLDED METAL EXI AN SI0N SHIELD.

APPLICATION FILED MAR. 29, I9I9.

1,350,562, Patented Aug. 24,1920.

ATTORN EY PATENT OFFICE.

JOHN EDWARD OGDEN, OF CORNWALL, NEW YORK.

FOLDED METAL EXPANSION-SHIELD.

Specification of Letters Patent.

Patented Aug. 24, 1920.

Application filed March 29, 1919. Serial No. 286,146.

To all whom it may concern:

Be it known that I, JorrN EDWARD OGDEN, a citizen ofthe United States of America, and a resident of Mountainville, town of Cornwall, Orange county, and State of New York, have invented certain new and useful Improvements in Folded Metal Expansion- Shields, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to improvements in expansion shields and its object is to provide a simple and inexpensive device for use as a bolt anchor for securing a bolt or screw to structures of cement, brick or other material with which the threads of the bolt or screw will not engage effectively, and to provide a method of making such a device of sheet metal.

In order that my invention may be thoroughly understood, I will now proceed to describe the same in the following specification, and will then point out the novel features thereof in appended claims.

Referring to the drawings:

Figure 1 is an elevation of a blank of sheet metal which is rolled to make an expansion shield.

Fig. 2 is an edge view of the same blank. Fig. 3 is an elevation of the shield made of the blank shown in the preceding figure.

Fig. & is an elevation of a modified form of blank. I

Fig. 5 is an elevation of the shield made of the blank shown in Fig. 4.

Fig. 6 isan elevation of a blank of modified form which is shown in Fig. 7, rolled into a shield.

Fig. 8 is an elevation of another form of blank which may be used in carrying out my invention.

Fig. 9 is a sectional elevation of a portion of a wall with a hole drilled therein and with an expansion shield or bolt anchor of the form shown in Fig. 7, shown driven therein. The end portion of a lag screw started into the shield is shown in elevation in this figure. I

In Fig. 1, 1O designates the upper edge of the blank and 11 its lower edge, which is substantially twice as long as the upper edge. 12 is a side edge of this blank which is substantially perpendicular to its upper and lower edges, and 13 is the other edge which .thus completes an undivided blank. According to the method herein disclosed, this blank is first cut out of sheet metal. Then all but the upper part of its surface is corrugated 011 diagonal lines as shown at 1& spaced equally apart at a distance equal to the pitch of the screw which is to be used with the finished shield. These corrugations may increase in depth toward the lower edge of the blank as shown in Fig. 2.

This blank is rolled around an axis which is to be the center of the tubular shield, to form the structure shown in Fig. 3. The length of the upper side 10 is substantially equal to the periphery of. the upper end of the tube thus formed, but as the other parts of the blank are wider than this upper edge, the metal will be wrapped around itself be low this upper edge to an increasing extent to the lower edge of the tube. lVith this particular form of structure it is desirable to have the outside of the tube cylindrical, but as the walls thereof are thicker at the lower end of the tube on account of the excess of metal provided by the wide bottom 11 of the blank, it is desirable to have the bore of the shield or tube tapered.

The blank shown in Fig. 4 has its upper part 15 of a width about equal the periphery of the tube into which it is to be rolled so that the edges 16, 16 of this part will abut so that excess of metal is provided as in the other case near the lower end of the shield. This form of blank is also corrugated and then wound into a tube with a tapered bore and a substantially cylindrical exterior.

The blank shown in Fig. 6 has both its upper and lower edges 20 and 21. of about the same width and about equal to the periphery of the shield which it is to form. The side :22 is perpendicular to these edges, but in this case the widest part of the blank is between the side 22 and a point 23 intermediate the upper and lower edges.

This form of blank may be wound into a tube with a non-tapered or cylindrical bore as shown in Fig. 7, the outside diameters of the ends of which will be equal but the outside ofwhich will taper from both ends to the part where the point 23 lies where there is the greatest excess of metal.

The blank shown in Fig. 8 will form a 7 some on the outside.

similar shield to that shown in Fig. 7' except that the upper part 24: thereof will not overlap and as both ofits sides flare instead of but one of them, the overlapped metal will lie some on the inside of the tube and But in either case the result isto thicken the walls of the tube at desired parts thereof. t

The way this device is used as a bolt anchorage is shown in Fig. 9. hole of proper size to receive the shield is drilled in a wall 30, and the shield pla'c'ed therein. If thes'hield has a tapered bore and cylindricaloutside, it may fit the hole readily. The corrugations are so disposed as to lie in helical lines and are arranged to receive the threads of a device such as a lag screw 31. As the screw is forced in, the shield is expanded and the excess metal at the part of the shield where the bore is restricted becomes tightly crowded between 'the lag screw and the wall of the hole' and 'thus effectively holds the screw. I p

While it is desirable for the e'ifecti've'operation of this device that the bore be restricted some part of "the length 'of the shield when it is ready to receivethe lag screw or other device, it is'not necessary that the restriction of the bore be made when the device is manufactured. In connection with Figs. 6, 7 and 8, I have shown and described shields with nontapered or 'cylindrica'l bores. These have however, excess about certain parts of their length. A shield which was of' th'is form is shown bore 'is'tapered or'res'tri'c'tedas shown at 32.

screwing the bolt in forces this restricted p 'art loiitwardly again to form a secure anchorage in the manner previously described.

The corrugations shown are notneeded wl1'en "the blank of fwhi ch theshi'el ds are niacle are of soft metah v p H I beheve that many kinds of expansion shields ean be made according tothe novel "method herein set 'fo'r'tlnand have illustrated a number of forms of shields, which'ernbody the in ention order to show that 'I do not intend anylimitation's other than those 'i'niposecllby the appended claims.

hat 'I claim is 1 An expansion shield foime dof a blank io'f sheet metal having a smaller transverse dimension at one end "than at other "parts thereof, rolled areund a central axis into a tu'be withthe metal wrapped around itself to an increased extent atpeints away from i ..l r. 1 I

theend of smaller transverse d mension, the inside of said tube being constructed to be n i q bythe threads fa b 2. An exp an'sion shield formed of a blank of sheet metal having "a smaller transverse dimension at one end than atbther parts thereof, said blank being corrugated and rolled around a central axis into a tube with metal wrapped around itself to an increased extent at points away from the end of smaller transverse dimension.

3. An expansion shield formed of a blank of sheet metal having a smaller transverse dimension at one end than at other parts thereof, said blank being corrugated and rolled around a central axis into a tube with the metal wrapped around itself to an increased extent at points away from the end of smaller transverse dimension with the corrugations so disposed as to lie helically in the tube. V

An expansion shield formedof a blank of sheet metal having a smaller transverse the metal wrapped around itself to an increased extent at points away from the end 'of 's'mallertransverse dimension with the corrugations increasingin depth "away from said end of "smaller transverse dimension and so disposed as to lie helica'lly in the tub a 7 5. An ex'pansion shield formed of a blank of sheet metal having a smaller transverse dimension at one end than at other parts thereof, rolled 'arounda central axis into a tube formed to receive the threads of a bolt, a partoffthe bore of said tube being arranged to be restricted in at least 'one'of' its transverse dimensions 'before a bolt is inserted therein, and the metal of said blank being wrapped around itself nearthe part of the shield having the restricted bore.

'6. An expansion shield formed of a blank of sheet metal having a smaller transverse dimensionat one end than at other parts "thereof, rolled around a central axis-into a tube with a tapered bore, with the metal wrapped around itselfto an increased-extent near the part of the device where the bore is "tapered, the inside of said tube being con- 's'tructed to be "engaged by the "threads of a bolt. I

7; expansion shield formed of a blank ofs'heet metal having a'partat one endof a predeterminel width and other parts there- *of wider, ro'lledfiaroun'd a central axis into a tube having a circumference approximately equal said predetermined width with the manor the wider-parts of the blank wrapp'ed ardund itself to increase the "thickness of the wallsof't'he tube, the inside of said tube being constructedto -be engaged bythe threads of'a bolt.

8. Anexpansion shield formed a blank ofsheet metal having a partat one end of around itself to increase the thickness of the walls of the tube.

9. An expansion shield formed of a blank of sheet metal having a part at one end of a predetermined width and other parts thereof wider, said blank being corrugatedand rolled around a central axis into a tube having a circumference approximately equal said predetermined width, with the metal of the wider parts of the blank wrapped around itself to increase the thickness of the walls of the tube, with the corrugations so disposed as to lie helically in the tube.

10. An expansion shield formed of a blank of sheet metal having a part at one end of a predetermined width and other parts of the blank flaring to greater widths, rolled around a central axis into a tapered tube with the circumference of the tube at the larger end of the bore approximately equal said predetermined width with the metal of the wider parts of the blank wrapped around itself to progressively increase the thickness of the walls of the tube as the size of the bore decreases.

11. An expansion shield formed of a blank of sheet metal having a part at one end of a predetermined width and other,

parts of the blank flaring to greater widths, said blank being corrugated, rolled around a central axis into a tapered tube with the circumference of the tube at the larger end of the bore approximately equal said predetermined width with the metal of the wider parts of the blank wrapped around itself to progressively increase the thickness of the walls of the tube as the size of the bore decreases, with the corrugations so disposed as to lie helically in the tube.

12. The herein described method of forming an expansion shield which comprises cutting out a blank of sheet metal with a smaller transverse dimension at one end than at other parts thereof, rolling said blank around a central axis into a tube and wrapping some of the metal around itself to an increased extent at points away from the end of smallertransverse dimension.

13. The herein described method of forming an expansion shield which comprises cutting out a blank of sheet metal with a smaller transverse dimension at one end than at other parts thereof, corrugating the metal, rolling said blank around a central axis into a tube and wrapping some of the metal around itself to an increased extent at points away from the end of smaller transverse dimension.

14:. The herein described method of forming an expansion shield which comprises cutting out a blank of sheet metal with a smaller transverse dimension at one end than at the other parts thereof, corrugating the metal rolling said blank around a central axis into a tapered tube with the part of the blank of smaller transverse dimension forming the larger part of the bore of said tube and wrapping the wider parts of the metal around the tube to progressively increase the thickness of the walls of the tube around the part thereof where the size of the bore decreases.

In witness whereof I have hereunto set my hand this 10th day of February, 1919.

J. EWD. OGDEN. l Vitness:

I. B. Moore. 

